90.
A test has 6 multiple choice questions, each with 4 alternatives. What is the probability of
guessing 5 or more questions correctly?
A. .5340
B. .4660
C. .9954
D. .0046
P(X 5) = P(X = 5) + P(X = 6)
P(X 5) = (.0044) + (.0002) = .0046
AACSB: Analytic
Bl
114.
X has the following probability distribution P(X):
Compute the variance value of X.
A. 1.58
B. .955
C. .912
D. .625
E[X] = (1)(.1) + (2)(.5) + (3)(.2) + (4)(.2) = 2.5
= (1 - 2.5) (.1) + (2 - 2.5) (.5) + (3 - 2.5) (.2) + (4 - 2.5) (.2) = .9125
AACSB:
82.
If the probability distribution of X is:
What is the variance of X?
A. 1.0
B. 5.0
C. 2.25
D. 2.24
AACSB: Analytic
Blooms: Application
Bowerman - Chapter 05 #82
Difficulty: Medium
Learning Objective: 05-02 Find a discrete probability distribution and c
106.
Consider a Poisson distribution with an average of 4 customers per minute at the local grocery
store. If X = the number of arrivals per minute:
Find the standard deviation of X.
A. 2
B. 4
C. 16
D. 1.5
x = 4 = 2.00
AACSB: Analytic
Blooms: Application
128.
A lawyer believes that the probability is .3 that she can win a discrimination suit. If she wins the
case she will make $40,000, but if she loses she gets nothing. Assume that she has to spend
$5000 preparing the case. What is her expected gain?
A. $
Bowerman - Chapter 05 #120
Difficulty: Hard
Learning Objective: 05-02 Find a discrete probability distribution and compute its mean and standard deviation.
Topic: Discrete Probability Distribution
121.
Consider the experiment of tossing a fair coin three
Topic: Binomial
135.
The Post Office has established a record in a major Midwestern city for delivering 90% of its
local mail the next working day. Of the eight, what is the average number you expect to be
delivered the next day?
A. 3.6
B. 4.0
C. 7.2
D. 2
98.
For a binomial process, the probability of success is 40% and the number of trials is 5.
Find the variance.
A. 5.0
B. 1.2
C. 2.0
D. 1.1
= (5)(.4)(.6) = 1.2
AACSB: Analytic
Blooms: Application
Bowerman - Chapter 05 #98
Difficulty: Medium
Learning Objec
Learning Objective: 05-03 Use the binomial distribution to compute probabilities.
Topic: Binomial
143.
A large disaster cleaning company estimates that 30% of the jobs it bids on are finished within
the bid time. Looking at a random sample of 8 jobs that